Geoid

The geoid (/ˈdʒiː.ɔɪd/ JEE-oyd) is the shape that the ocean surface would take under the influence of the gravity of Earth, including gravitational attraction...

Grid Cells NAC (patended), area codes (area can be indefinitely small) GEOID, the name of United States Census Bureau geographic identifiers. In the...

between the two, referred to as geoid undulations, geoid heights, or geoid separations, will be irregular as well. The geoid is a surface along which the...

The Indian Ocean Geoid Low (IOGL) is a gravity anomaly in the Indian Ocean. A circular geoid low situated just south of the Indian peninsula, it is the...

and gravimetric geoids. By matching the relative astro-geodetic geoids of the selected datums with an earth-centered gravimetric geoid, the selected datums...

the study of Earth's gravitational field is called physical geodesy. The geoid essentially is the figure of Earth abstracted from its topographical features...

approximate the geoid by a mathematically simpler reference surface. The simplest choice for the reference surface is a sphere, but the geoid is more accurately...

anomalies, defines the geoid of the Earth, which approximates the local mean sea level for locations in the open ocean. The geoid includes a significant...

ellipsoid. This difference is the geoid height, positive above or outside the ellipsoid, negative below or inside. The geoid height variation is under 110 m...

are measured from is called the quasi-geoid (or quasigeoid), a representation of mean sea level similar to the geoid and close to it, but lacking the physical...

is a planetary geoid that represents the gravitational and rotational equipotential figure of Mars, analogous to the concept of geoid ("sea level") on...

geometric reference frame and geopotential datum, based on GPS and gravimetric geoid models. NAVD 88 was established in 1991 by the minimum-constraint adjustment...

Earth's shape can be thought of in at least two ways: as the shape of the geoid, the mean sea level of the world ocean; or as the shape of Earth's land...

separation between the geoid and the reference ellipsoid is called the undulation of the geoid, symbol N {\displaystyle N} . The geoid, or mathematical mean...

undefined value: it refers to an altitude of 0 meters above the geoid. The use of a geoid stands in contrast to GeoJSON, which uses direct ellipsoid height...

and dimensions, such as a reference ellipsoid or a geoid; an origin at which the ellipsoid/geoid is tied to a known (often monumented) location on or...

and their proper motions precise astronomical navigation astro-geodetic geoid determination modelling the rock densities of the topography and of geological...

Fundamentals Geodesy Geodynamics Geomatics History Concepts Geographical distance Geoid Figure of the Earth (radius and circumference) Geodetic coordinates Geodetic...

ellipsoid surface) or altitude/elevation (above and below the geoid). The areoid (the geoid of Mars) has been measured using flight paths of satellite missions...

topography, geodesy employs an idealized Earth producing a shape called a geoid. Such a geoid shape is gained if the ocean is idealized, covering Earth completely...